Texas became a part of the United States. 
Long ago, Texas was its own land.
Some leaders in the United States said no at first. They did not want to start a war. They also had many arguments about rules for the land.
Later, a leader named John Tyler worked hard on a plan. He wanted Texas to join the Union. 
Many people voted for this change. Texas became the 28th state in 1845.
Joining the United States changed the map forever.
Texas was once its own country. It was called the Republic of Texas.
In 1836, Texas declared independence from Mexico. Many people in Texas wanted to join the United States. At first, U.S. leaders said no. They did not want a war with Mexico. They also argued about slavery. 
President John Tyler wanted to change this. He worked on a secret plan to bring Texas into the Union. This plan was a treaty, which is a formal agreement. In 1844, the U.S. Senate rejected this treaty. However, James K. Polk won the next election. He promised to help Texas join the United States.
Congress passed a new bill to help. Texas voters approved the plan. On December 29, 1845, President Polk signed the bill. Texas became the 28th state. This change led to the Mexican-American War in 1846. 
Texas became the 28th state in the United States in late 1845. Before it was a state, it was its own country called the Republic of Texas.
There were many hard reasons why the U.S. said no. Leaders in the U.S. did not want to start a war with Mexico. Mexico did not recognize Texas as a free country. There were also big arguments in Congress about slavery. Texas was a large area where many people held slaves. Adding Texas to the United States would change the political balance. Both the Democratic and Whig parties were worried about these arguments. They did not want to add more tension to the country. 
President John Tyler decided to act on his own in 1843. He wanted to find a way to bring Texas into the Union. He worked on secret talks with the leaders of Texas. These talks led to a treaty of annexation in April 1844. A treaty is a formal agreement between two groups. When the U.S. Senate saw the details, they rejected the treaty in June 1844. 
Politics changed everything in the election of 1844. James K. Polk ran for president and promised to help Texas join the U.S.
Joining the United States changed the map and the future of North America. This move led to a new conflict called the Mexican-American War. That war began in April 1846. 

Texas annexation was the process of the Republic of Texas joining the United States. This event occurred in late 1845. Texas became the 28th state of the Union on December 29, 1845.
The history of Texas land involves many different nations. For over 300 years, the area was part of the Spanish Empire. Spanish explorers and settlers arrived in the late 17th century. They built missions and forts to settle the land. Later, the land became part of Mexico. In 1819, the Adams-Onis Treaty settled some borders between the United States and Spain. This treaty established the southern boundaries at the Sabine and Red Rivers. This agreement meant the United States did not own Texas at that time.
Many American leaders wanted to acquire Texas for many years. Thomas Jefferson believed Texas would become the richest state in the Union. However, there were many reasons why the United States did not act quickly. The U.S. government did not want to start a war with Mexico. Mexico had outlawed slavery and did not recognize Texas as a sovereign country. 
President John Tyler played a central role in the annexation process. In 1843, Tyler decided to pursue annexation on his own. He wanted to gain support for his presidency. He engaged in secret negotiations with the Texas administration. These talks resulted in a treaty of annexation in April 1844. 
The election of 1844 changed the direction of the annexation. James K. Polk ran for president on a platform of Manifest Destiny. This idea supported the expansion of U.S. territory. Polk won the election against the Whig candidate, Henry Clay.
On March 1, 1845, President Tyler signed the annexation bill. He offered immediate annexation to Texas on his last day in office. When James K. Polk took office, he encouraged Texas to accept. The people of Texas approved the agreement through a popular vote. 
The annexation of Texas had significant consequences for North America. It led directly to the Mexican-American War in April 1846. This war began because of the disputes over sovereignty and borders. 

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